in March 1926. Goddard continued to achieve many firsts in the field of rocketry with funding from institutions such as the Smithsonian. In 1919, the Smithsonian Institution published Robert Goddard's groundbreaking work, A Method of Reaching Extreme Altitudes. Other than from sources like the Smithsonian, Goddard received little public support for his research during his lifetime. He was the first to recognize the scientific potential of liquid fuel rockets in space travel and was instrumental in bringing about the design and construction of those rockets needed to implement those ideas. Though his work in the field was revolutionary, he was sometimes ridiculed by the public and in the press for his theories concerning spaceflight and therefore became protective of his privacy and his research work. Years after his death, as manned spaceflight finally became a reality, Goddard at long last came to be recognized as the man who pioneered modern rocketry and ultimately space exploration. On October 5, 1964, the U.S. Post Office issued a postage stamp commemorating Robert Goddard. The stamp depicts an image of Goddard next to a rocket launching from the Kennedy Space Center. The Post Office released the stamp issues at a ceremony held in New Mexico. Goddard's wife, Esther Goddard, attended the ceremony. She was given the honor of pressing the button launching two rockets, one of which flew some mile and a half into the air. The two rockets each carried 1,000 first day covers, and after parachuting to the ground were recovered with the first day covers later sold to collectors. Designed by Robert J. Jones and printed on the Giori press, the quantities for this issue totaled more than 62 million. Accomplishments in Space Commemorative Issue of 1967 Gemini IV was a June 1965 manned space flight in NASA's Gemini program. It was the second manned Gemini flight, the tenth manned American flight and the 18th spaceflight of all time (includes X-15 flights over ). It was crewed by James McDivitt and Ed White. The highlight of the mission was the first space walk by an American, during which White remained tethered outside the spacecraft for 22 minutes. Tied to a tether, White fired his oxygen powered "zip gun" and floated out of the capsule. He traveled fifteen feet (five meters) out, and began to experiment with maneuvering. He found it easy, especially the pitch and yaw, although he thought the roll